Apparatus for filling dental mold flasks

ABSTRACT

A device to vibrate dental mold flask as the investment material is being placed in the flask to form the mold in which the operator may have both hands free to manipulate the flask and the container in which the investment material was mixed. The vibrating device being activated by placing the mold on the device which includes a lever to be vibrated by a cam.

United States Patent Inventor Hans Lea Frankfurt am Main, Germany App].No. 861,342

Filed Sept. 26, 1969 Patented Nov. 16, 1971 Assignee Deutsche GoId-UndSiIber-Scheideanstalt Vormals Roessler Frankfurt am Main, GermanyAPPARATUS FOR FILLING DENTAL MOLD FLASKS 3 Claims, 1 Drawing Fig.

US. Cl 259/72,

259/91, 164/260, 164/39, 164/376, 25/41 J Int. Cl.. B011 11/00 Field ofSearch 164/260,

39, 376, 223,196, 203; 259/1 72, DIG. 20, 25, 26, 91, DIG. 41, DIG. 44;25/41 J; 18/17 A, 17 D; 264/71 [56] References Cited UNITED STATESPATENTS 1,648,530 11/1927 A1torfer.... 259/72 X 1,705,162 3/1929 Wahl259/DIG. 41 1,756,325 4/1930 Williams... 164/260 X 1,918,018 7/1933Clark 259/72 2,116,367 5/1938 Smith 164/260 X 2,494,866 l/l950 Fressola259/72 X 2,846,201 8/1958 Mermelstein 259/72 2.988.084 6/1961 Douglas259/D1G. 41 3,278,167 10/1966 Bowman 259/D1G. 41

Primary Examiner.1. Spencer Overholser Assistant Examiner-John S. BrownAttorneys Francis D. Stephens and Hugo Huettig, .Ir

ABSTRACT: A device to vibrate dental mold flask as the investmentmaterial is being placed in the flask to form the mold in which theoperator may have both hands free to manipulate the flask and thecontainer in which the investment material was mixed, The vibratingdevice being activated by placing the mold on the device which includesa lever to be vibrated by a cam.

PATENTEDunv 16 I971 mii INVENTQR Hams Lew APPARATUS FOR FILLING DENTALMOLD FLASKS This invention relates to an apparatus for the manufactureof mold in the fine-casting technique and especially in the lostwaxdental technique. In the production of cast metal work for the use indentistry, the cast wax model is usually arranged in a container orflask and this model is then surrounded with a plasterlike castinginvestment material which, after it has hardened, and after the wax hasbeen removed, is used as the molding form for the final cast model.

The various steps that have to be accomplished include in this instance,a mixing of the mass of investment material, a subsequent casting ofthis material into the container in which the wax model of the piece tobe cast is supported and the container or flask must be vibrated duringthe filling process by a vibrating mechanism which guarantees a betterdistribution of the mass within the flask, which with the investmentmaterial makes up the mold and prevents the danger of air bubbles.

The object of this invention is to produce an apparatus which makes itpossible to accomplish the filling-in process in a short period of timeand without any difficulties. In accordance with this invention, ashaking or vibrating mechanism is used which turns on automatically whenthe container is placed upon it. The person performing this process hastherefore both hands free for the most important operation of fillingthe casting mold. Any manual actuation of switches or the like is notnecessary.

Similar working processes can also be accomplished in the technique ofcasting fine jewelry.

The means by which the objects of this invention are obtained aredescribed more fully with respect to the accompanying drawing which is aschematic cross-sectional view through the apparatus.

This apparatus consists of a ball 1 which is attached on the end of alever In that carries it. Said lever can be oscillated around the axis 2as a fulcrum. The arm 11; of the lever which lies opposite the ball 1makes actuation of a switch 3 possible, which in turn, actuates thedrive motor of the vibrating mechanism. This motor is not shown in thedrawing. The lever arm lb, when in its rest position, is held in placeby a tension spring 4. The vibrating of the lever is caused by aneccentric disk 6, which is driven by the motor, not shown. Thiseccentric disk 6 acts on a roller bearing 5, so that, for practicalpurposes, no forces of friction can arise between the eccentric disk andthe lever which is vibrated by rotation of said eccentric disk. Theapparatus as shown in the drawing, is used by the person operating it bypressing the flask 7, including the wax model on the ball 1 so that theflask is supported by said ball. The operator then exerts a pressure onthe ball 1 by moving flask 7 downwardly. The drive motor is turned on bythe switch 3 and the vibration process is started at the same time sothat the operator using this apparatus can take one hand to pour theinvestment material from a container 8 into the container or flask 7,while the process of vibrating is still going on. After this process offilling has been accomplished, the container 7 is lifted from the ball1, whereupon the arm 1b of the lever moves back into its rest positionunder the influence of the tension spring 4 and the motor isautomatically switched off by means of the switch 3.

With the apparatus of the present invention, the person operating thisapparatus can accomplish the process of filling the flask with the massof investment material without it being necessary to actuate anyswitches for the accomplishment of the process of vibration.

Having now described the means by which the objects of this inventionare obtained,

Iclaim:

1. An apparatus for vibrating the flask in making a mold, said apparatuscomprising a ball element, means to vibrate said ball and switch meansactivated by downward pressure on said ball to actuate said means tovibrate said ball, whereby when said ball is pressed downwardly by aflask, the flask will be vibrated.

2. The apparatus of claim 1 in which said ball is mounted on a lever,and said switch means is operated by movement of said lever.

3. The apparatus of claim 2 in WhlCh said lever is provided with aroller bearing which is moved by movement of said lever into a positionfor engagement with said means to vibrate said ball.

1. An apparatus for vibrating the flask in making a mold, said apparatuscomprising a ball element, means to vibrate said ball and switch meansactivated by downward pressure on said ball to actuate said means tovibrate said ball, whereby when said ball is pressed downwardly by aflask, the flask will be vibrated.
 2. The apparatus of claim 1 in whichsaid ball is mounted on a lever, and said switch means is operated bymovement of said lever.
 3. The apparatus of claim 2 in which said leveris provided with a roller bearing which is moved by movement of saidlever into a position for engagement with said means to vibrate saidball.